package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    //微信登录接口地址
    public static final String WX_LOGIN_URL ="https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {

        log.info("微信登录：{}",userLoginDTO);
        //调用微信接口服务，获取得当前微信用户的openid

        String openid=getOpenid(userLoginDTO.getCode());

        //判断openid是否为空，如果为空，则表示登录失败爆出业务异常

        if (openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);

        }

        //判断当前的微信用户是不是一个新的用户（当前的openid是否是不是表里面的）

        //如果是新用户，则自动完成注册，返回用户对象
        User user = userMapper.getByOpenid(openid);
        if (user==null){
            user=User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }
        return user;
    }

    /**
     * 调用微信接口服务，获取openid
     * @param code
     * @return
     */
    private String getOpenid(String code){
        Map<String, String> map=new HashMap<>();
        map.put("grant_type", "authorization_code");
        map.put("appid",weChatProperties.getAppid());
        map.put("Secret",weChatProperties.getSecret());
        map.put("js_code",code);
        //获取返回的结果
        String json = HttpClientUtil.doGet(WX_LOGIN_URL,map);
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
